I think you can argue that the sort of person who has £102k to spend on a car like that can afford £80k depreciation over 100k miles/5 years.
The new owner will no doubt complain when their £20k RR needs a £1000 repair every few months though
At least the original owner got some decent use out of it though
When you buy a brand new car, you work-out how much you lost in deprecation compared to what you paid for it when new.
But when you buy a second-hand car, you have no way of knowing what the first owner actually paid for it (be it cash or through finance), so you tend to calculate the deprecation based on the RRP at the time the car was new.
But few cars are actually sold at RRP. Two examples:
in 2001 I bought a 6-months old Vauxhall Omega. The RRP was £24,000, I paid £14,000. But the car didn't actually lose £10k in 6 months... Omegas were rarely bought by private owners, and my car was indeed an ex-fleet car, and one can only imagine what level of discount Vauxhall offered the original fleet buyer.
Last year Tesla announced a modification to their battery technology, and at the same time offered massive discounts on all cars that they had already built with the current battery and were in stock. A colleague with a nose for bargains opted for top-of-the-range Model-X P100D with Ludicrous Mode and lifetime free charging. 19-Reg. The RRP was £120,000, he got the car for £80,000 (on finance).
Future owners might look at that what they paid compared to the RRP and think that the first owners had deep pockets and money to burn. Not so... the first owner may have in fact been a very shrewd businessman.